Author:
Nandi Anuj,Singh Swapnil,Jaiswal Bhavesh,Jain Anand,Verma Smrati,Palawat Reenu,B.T Ravishankar,Singh Brajpal,Tyagi Anurag,Das Priyanka,Bose Supratik,Verma Supriya,Gautam Waghmare Rahul,K.R Yogesh Prasad,Raha Bijoy,Mendhekar Bhavesh,K Sathyanarayana Raju,V Srinivasa Rao Kondapi,Kumar Sumit,Thakur Mukund Kumar,Bhatia Vinti,Sharma Nidhi,Yenni Govinda Rao,Satya Neeraj Kumar,Raghavendra Venkata,M.S Vivechana,Justin Evangelin Leeja,Karmakar Praloy,Patra Anurag,J Naga Manjusha,Srikanth Motamarri,Rajhans Chinmay Kumar,K Kalpana,P. Veeramuthuvel
Abstract
SHAPE (Spectro-polarimetry of HAbitable Planet Earth) is an experiment onboard Chandrayaan-3 Mission for the study of spectro-polarimetric signatures of the habitable planet Earth in the near-infrared (NIR) wavelength range (1.0 - 1.7 µm). The spectro-polarimeter is the only scientific payload (experimental in nature) on the Propulsion Module (PM) of Chandrayaan-3 mission. The instrument is a compact and light-weight spectro-polarimeter with an Acousto-Optic Tunable Filter (AOTF) at its heart. The AOTF operates in the frequency range of 80 MHz to 135 MHz with a power of 0.5 - 2.0 Watts. The two output beams (e-beam and o-beam) from the AOTF are focused onto two InGaAs detectors (pixelated, 1D linear array) with the help of focusing optics. The primary (aperture) optics of ~ 2 mm diameter collects the NIR-light for input to the AOTF, defining the FOV of 2.6°. The payload is realized with a mass of 4.8 kg and a power of 25 Watts. In this manuscript, we highlight some of the ground-based results including the post-launch initial performance of the payload while orbiting around the Moon to observe Earth.
Publisher
The Aeronautical Society of India
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